Vacuum-bottle.



J. P. LAMB.

VACUUM BOTTLE. Arrmommn'nnnn SEPT. 16, 1913.

Patefited 001;.13, 1914.

WITNESSES:

ATTORNEY.

UNITED sTATEs PATENT oFFIcE.

JOSEPH F. LAMB, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR T0 LANIOERS, FIBARY & CLARK, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

VACUUM-BOTTLE.

Specification of Iietters Patent.

Patented Oct. 13, 1914.

Application filed September 16, 1913. Serial No. 790,020.

To all whom it may concern:

Be it known that'I, JOSEPH F. LAMB, a'

vacuum bottles having certain new and use;

ful features of construction.

The drawing is a central vertical section of a bottle embodying my invention.

Heretofore there has been considerable difficulty experienced in properly support: ing the two walls of the bottle from one another at or near the bottom, such a support being necessary in order to avoid breakagewhich would otherwise result. It has been customary to make the two walls which constitute the double-walled structure and from between which the air is exhausted, as nearly parallel as possible, but experience shows that due to unequal expansion and contraction it is almost impossible to space those two walls apart a definite amount. This variation becomes troublesome when the supports are inserted, which is done before the bottom of the outer bottle is closed in, and

it has been necessary to carefully change the thickness of the supports or to indent the other wall of the bottle to a greater or less extent until it was pressed down upon the support. The first method consumed considerable time, and was aslow, tedious and expensive process. The second method draws the glass, thinning the wall around the indentations, making it more liable to crack or break at these points.

In accordance with my lnvention I in cline one of the walls a relative to the other I), so that these walls are non-parallel and i diverge toward the bdttom of the bottle. In

the drawings Ihave shown the lower part of the inner wall tapered slightly. The

amount of this incline need not be great, and no more than enough to offset any variations which may be caused by uneven expansion and contraction of the glass. The supports 0 can now all be made of a uniform thickness which may be entered between the two walls at the point of their greatest divergence, and crowded up into position until they properly support the two walls one from another. By this means patching and fitting of the supports is entirely obviate as is the necessity of indenting the outer bottle in order to make it contact with the sup port, the result being that neither of the walls is weakened and the expense of manufacturing is considerably reduced and the rate of production increased. I claim as my invention "1. In a device of the character described, a double-walled structure provided with side walls which are plain cylinders, and curved end portions, said side walls being nonparallel, and supports insertible between the non-parallel portions of said walls and ada ted to be wedged into contact with both wal s.

2. A vacuum insulated container comprising a double-walled structure, the sides of which are plain cylinders non-parallel throughout at least a art of their length, and supports insertib e between the nonparallel portions of said walls and movable toward the 4 converging parts thereof to space said walls one from the other.

JOSEPH F. LAMB.

WVitnesses: S. H. RAYMOND,

D. G. MODEEN. 

